18.2 PPS Inputs

Each digital peripheral has a dedicated PPS Peripheral Input Selection (xxxPPS) register with which the input pin to the peripheral is selected. Devices that have 20 leads or less (8/14/16/20) allow PPS routing to any I/O pin, while devices with 28 leads or more allow PPS routing to I/Os contained within two ports (see the table below).

Important: The notation “xxx” in the generic register name is a placeholder for the peripheral identifier. For example, xxx = T0CKI for the T0CKIPPS register.

Multiple peripherals can operate from the same source simultaneously. Port reads always return the pin level regardless of peripheral PPS selection. If a pin also has analog functions associated, the ANSEL bit for that pin must be cleared to enable the digital input buffer.

Table 18-1. PPS Input Selection Table
Peripheral	PPS Input Register	Register Reset Value at POR		Default Pin Selection at POR
Peripheral	PPS Input Register	14/16-Pin Devices	20-Pin Devices	14/16-Pin Devices	20-Pin Devices
External Interrupt	INTPPS	`‘b000 010`		RA2
Timer0 Clock	T0CKIPPS	`‘b000 010`		RA2
Timer1 Clock	T1CKIPPS	`‘b000 101`		RA5
Timer1 Gate	T1GPPS	`‘b000 100`		RA4
Timer3 Clock	T3CKIPPS	`‘b010 101`		RC5
Timer3 Gate	T3GPPS	`‘b010 100`		RC4
Timer2 Input	T2INPPS	`‘b000 101`		RA5
Timer4 Input	T4INPPS	`‘b010 001`		RC1
CCP1	CCP1PPS	`‘b010 101`		RC5
CCP2	CCP2PPS	`‘b010 011`		RC3
PWM Input 0	PWMIN0PPS	`‘b010 101`		RC5
PWM Input 1	PWMIN1PPS	`‘b010 011`		RC3
PWM1 External Reset	PWMIN1ERSPPS	`‘b000 101`		RA5
PWM2 External Reset	PWMIN2ERSPPS	`‘b010 001`		RC1
CWG1 Input	CWG1PPS	`‘b000 010`		RA2
CLCIN0	CLCIN0PPS	`‘b010 011`	`‘b000 010`	RC3	RA2
CLCIN1	CLCIN1PPS	`‘b010 100`	`‘b010 011`	RC4	RC3
CLCIN2	CLCIN2PPS	`‘b010 001`	`‘b001 100`	RC1	RB4
CLCIN3	CLCIN3PPS	`‘b000 101`	`‘b001 101`	RA5	RB5
SCL1/SCK1	SSP1CLKPPS⁽¹⁾	`‘b010 000`	`‘b001 110`	RC0	RB6
SDA1/SDI1	SSP1DATPPS⁽¹⁾	`‘b010 001`	`‘b001 100`	RC1	RB4
SS1	SSP1SSPPS	`‘b010 011`	`‘b010 110`	RC3	RC6
SCL2/SCK2	SSP2CLKPPS⁽¹⁾	`‘b010 100`	`‘b001 111`	RC4	RB7
SDA2/SDI2	SSP2DATPPS⁽¹⁾	`‘b010 101`	`‘b001 101`	RC5	RB5
SS2	SSP2SSPPS	`‘b000 000`	`‘b000 001`	RA0	RA1
RX1/DT1	RX1PPS	`‘b010 101`	`‘b001 101`	RC5	RB5
CK1	CK1PPS	`‘b010 100`	`‘b001 111`	RC4	RB7
RX2/DT2	RX2PPS	`‘b010 001`		RC1
CK2	CK2PPS	`‘b010 000`		RC0
ADC Conversion Trigger	ADACTPPS	`‘b010 010`		RC2

Note:

Bidirectional pin. The corresponding output must select the same pin.